Nice and well thought out flag! It ticks all boxes for a good design.
I think I prefer this to the most famous keystone proposal. Putting the keystones in the middle make them more clearly look like keystones, rather than just a strange middle field. Matching William Penn's coat of arms is also a nice bonus.
Popular "keystone" proposal for reference:
Thanks! The Keystone Flag design is also really nice, but I personally prefer mine for the colors and symbolism (totally not biased at all).
This is my flag redesign for Pennsylvania, also known as the Keystone State. This is probably one of my favorites.
Symbolism
Here you go: Link
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